Coin-operated telephone apparatus for automatic telephone exchanges



Nov. 4, 1930.

W. KRUSE COIN OPERATED TELEPHONE APPARATUS FOR AUTOMATIC TELEPHONE EXCHANGES .Fild Dec. 20, 1928 [I] Ie/epbone Jnventor Wilhelm Kruse A by MW Attorney Patented Nov. 4, 1930 UNITED stares rarsnr apt-m:

wInnE'LM KnUsE, on BERLIN, GERMA Y COIN-OPERATED TELEPHONE APPARATUS FOR AUTOMATIC TELEPHONE EXCHANGES Application filed December- 20, 1928,.Serial No. 327,233, and in Germany December 23, 1927.

my'prior Patent No. .1,691,575, coinoperated telephone apparatus for automatic telephone exchanges has been described, pose v sessing a. ,mechanical connecting system, which-after a certain number of SGHQS- of impulses will block further selection. Said.

device is intended to allow for the free selection at one eXchangeof a definite number of figures of the calling numbers only. Ifthe 19 last place of the free range of calling num bers has been selected, the next series of im pulses is rendered ineffective by means of a short:. circ uiting. remaining numerical values the impulse contact is only relcasechafter the introduction of a corresponding coin; into the said appara tus. Theprogressive switching-ofthe switch-. ing or connecting device is effected in the arrangement described in the patent referred to during the winding up of the selecting dial, that is prior to the delivery of the series of impulses; This construction, as shown in. the

patent, has the defectthat it is possible for a person operating the device to use the apparatus without paying the charge. If, for example, after winding up of the number disk, a person keeps the latter stationary in this position and presses the fork-carrier, he will, by so doing, force the ratchet-wheel, which has been moved forward by one of its teeth, backinto its original position. When further rows of impulses are sent out the ratchet wheel will be moved forward by that number of its teeth which corresponds to-the selected rows of impulses. And there would be no short circuit of the impulse contact owing to the fact that on winding up the number disk the ratchet wheel would be returned back to its position of rest.

To overcome this defect, the arrangement according to the present invention is such that the switching device is progressively switched only during or at the end of the series of impulses. To overcome this defect the ratchet wheel, in the present invention, is moved forward either simultaneously with or subsequently to the sending out of the impulses. According to the present invention there is also provided an adjustable stop by means of which the impulse contact is short For the selection of the wheelb connected with the formerin axialcircuited after a predetermined number of feeding steps. I y

In the drawing one mode of execution of the device is illustrated- I Figure 1 is a front elevation, I I Figure 2 a side elevation of the device, and Figure 3 a diagram of the connections. At each turning of the dial discthe lever a mounted at the opposite end of the same axis} is simultaneously turned to the top. During this winding up of thedial disk the switching device inthe form of aratchet wheel 6 is held locked by engagement of a spring pawl 6 with; V a notch of said wheel. After the release of I the finger dial disc, which is returned to its. position of rest a. by means of a spring known manner, the lever 64 will engagea tooth of the wheel band move the wheel I by .one' step independently of the selected number" and the impulses given by it. At the same time, the helical spring cconnected on the one part with the toothed wheel or gear 6 and with its stationary spindle on the other part, will be tensioned. .During the step-by-step rotation the toothed wheel will be held secure. in itsposition each time by means ,of the pawl-spring e. After a certain number of... steps ofrotation the contactsl, 2 will be closed by means of the insulated pin mount! ed on the toothed wheel I), thereby short circuiting the impulse contacts 1," 2 of; the dial. Thus an additional delivery of select ing impulses islprevented. i f

On the toothed wheel Z) there is mounted a stop pinh which can be screwed at willinto any one of a series of threaded holes 6. The said stop pin 3 h is screwed into a certain threaded hole according to the number of. steps of rotation to be made which it is de sired to permit before causing short circuiting of the impulse contact. V I e I The release of the device is effected in 1 the following manner. By pressure of the forked carrier upon the lever is the upper portion of said lever is moved towardthe face Z of the lever Z (Figure Q) with apin In on lever 70. s The lower forked portion Z of the lever l will thus displace the toothed n right hand owing to the inclinedsliding surdirection to the left hand (Figure 2) to such the selection of the fifth'i'pl'ace of figures and 1 5 7 V operatedtelephone apparatus, the said coin' the. desiredsubscriber will not be called When the sixth place of figures-is selected. If however, a coin 'Was, .duly placed into .the coinwill actuate the contact M W Kane the short circuit of the impulse contactof the number disc is again'finished, fland'the call of the desired subscriber Will be "efiect ed ithout restraint.

I claim:

LAn impulse .dial apparatus for telea phone systems of the character described comprising, in combination," a dial mechanism'adapted to send out a consecutive number ctsets of impulses according .to-special v 1 indications for calling a "particular subscriber, Ia stepby-Qstep mechanism associated Withsaiddial mechanism and-operated thereby, and'means operated'by said step-by-step 'mechanism for short circuiting the impulse I v y 4 H ity of setsof impulsesless than the, selected contacts of the dial" mechanism after a distinct number of sets of impulses has been sent out, said means being adjustable to vary 7 said number. 7 V a 2. An impulse dial apparatus for telephone systems of the character described comprising, in combination, a dial mecha-;

nism adapted to send out a consecutive number of'sets of impulses according to special I indications for calling a' particular subscriber, a step-by-step mechanism;associated With said" dial mechanism and operated -thereby,7means for short circuit-mg the im- 'pu1se'contacts of the dial mechanism and operated by said step-by-step mechanism after a'sele'cted' number of sets of'impulses hasbeen sent out, and means operable or not v at the w ll of the operator and actuated by cuiting the impulse contacts ofthe dial mechanism' after a selected number of sets of impulses has been sent out, and a second-contact adjustably connected With the rachet Wheel and selectively applicable thereto for short circuiting the impulse contacts of the dial mechanism after a number ofwsets of impulses'has beensent out less by one ormore sets thanthe selected'number,

' tJAn impulse dial apparatus tor tele prising, in'combination, an impulse dial 7 V I phone systems of thecharacter described com- 7 V mechanism adapted to send into the -line a consecutive number of sets of impulses to zoperatethe switching apparatus ineth'e eX- change according to; special indications marked on the dial for calling a particular subscriber, a ratchet wheel," pawlfand ratchet mechanism associated ithsaid im pulse dial mechanism for moving. said ratchet Wheel'by one tooth after the sending;

out of a 'set of impulses,,a projection'iuponi said heel, a contact operated by said p rof i jection after a distinct number of sets of impuls'es of the ratchet Wheel has been carried the dial mechanism, and anauxiliarycontact adjustablyconnected With the'ratchet Wheel lectively according to adjustmentf position relatively to the'firstnamed contact toshort 9o: outto short circuit the impulse contacts of 'circuit'the' impulse contactsafter a'pluralo numberhas been sentout -& V

5. 'Anap'par'atus: of the character described in accordance With claim 2 wherein the ratchet wheel is provided with aseries" or. spaced sockets to receive the auxiliary contact, whereby the'latter is adapted to operate a desired number of impulse steps aheadloi the main contact. v

In testimony nature.

' WIL E Karissa saidjstep-by-step mechanism' forshort'circultlng the mpulses of the dial mechanism independently of the first-named means upon the sending out of sets'oii' mpulses less than the selected number;

3. An impulse dial apparatus for telephonefsystems of the character described Whereof-j-Ihave aiiixed' my sig- I 

